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LeetCode82 Remove Duplicates from Sorted List II
题目:
Given a sorted linked list, delete all nodes that have duplicate numbers, leaving only distinct numbers from the original list.(Medium)
For example,
Given 1->2->3->3->4->4->5
, return 1->2->5
.
Given 1->1->1->2->3
, return 2->3
.
分析:
链表去重的follow-up,但是题号这个在前面,要把有重复元素,则所有该元素均删掉。
注意:
1. 使用dummy node处理头结点被删除掉的情况。
2. 只要有head-> next -> val存在时,先判断head -> next是否为空。
代码:
1 /** 2 * Definition for singly-linked list. 3 * struct ListNode { 4 * int val; 5 * ListNode *next; 6 * ListNode(int x) : val(x), next(NULL) {} 7 * }; 8 */ 9 class Solution {10 public:11 ListNode* deleteDuplicates(ListNode* head) {12 ListNode dummy(0);13 dummy.next = head;14 head = &dummy;15 while(head -> next != nullptr && head -> next -> next != nullptr) {16 if (head -> next -> val == head -> next -> next -> val) {17 int val = head -> next -> val;18 while (head -> next != nullptr && head -> next -> val == val) { //只要取head->next,先判断19 ListNode* temp = head -> next;20 head -> next = head -> next -> next;21 delete temp;22 }23 }24 else {25 head = head -> next;26 }27 }28 return dummy.next;29 }30 };
LeetCode82 Remove Duplicates from Sorted List II
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